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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53c85b4d207d281a17f53242c46837fa3c7e7235329d8639ecdcf1044b4e9e1' 
  AND token = 'oJ+87V3TNwyhhJgoCKBwiGgXt6tlOxRX132fSOGx0as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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