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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114d5ad4e7fd53739567d56b7fb1074ebd0e769a01df03b013955cc1c13a5fd4' 
  AND token = 'Gv6hIdGS98JRkWkCNX60p97/Hccmfo0G4ekvNpwztQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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