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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc1fcdd8dc78a53d31b13a3a25ed498d1f00ec8a62570d21038c4defc084a31' 
  AND token = 'ZSZyUm8455faFo30WNxRKP7DGIMPV82i/RdUlfy2qnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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