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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d57f79d798c9c38bdeb73838ff5a5139c0dfe64612d6ed489874285d14514a2' 
  AND token = 'SNjHLFEO4GqXotO5lF2c2qojEmHUh3i6tJTjfYedHHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}