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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92cf853ad9043269cc84ac87d8a8da7e2fced020d36ebd3f94d5e6b31c6b8cd' 
  AND token = 'CA+MHkCN7vbtXQAxIy/LocMlx5JxZENt9HWE0/qAB14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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