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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b67f3982a08b91ee7d869f8b7cb8af24208b3940e786712a36bbe6caba1bdf' 
  AND token = '3t778NdenIkxH7BGiwHH4FyDuQS2+MkPMSzZBSzVrVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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