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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ad1e2d1ec4c759fa04a6e7ade21366dc278f7a19de2bfa783e78beaa392a8f' 
  AND token = '7tlF5GLRPUTTCvBdH4tARS/U3FaJVYSNmO25uEsM9yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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