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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c751f168a5cd04597d0fc0cb2853f69ea95e7207d7c72418d27f5f9a2d0776' 
  AND token = 'iGGdwLmMPL0jPheMAS/egTZON1Cza5sb+FgyucfHDSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00368

JSON explain

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