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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37335bc00fd540ce69bab83c953939d39f3ca4a85d2ba30b4ea9ad938ab7f174' 
  AND token = 'yYd8bA1O9WUvN0NzjdrNUYhppwSL6hTxJgcbNaD8zaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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