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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90cb97851e0ed2a3c0728b0d2c6ad45400ce96d9b77aa3fc90172d20d3bab32' 
  AND token = 'GLPtALOEQeJlE3lRW/Ttkv5eKEEL+WdwUPHWT9iflck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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