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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b05dfd0054b1ebb3b3f6e07cf0b1dc3b29258691d79fbe5b1beae93a84347c' 
  AND token = 'EABi0BYI/CGNrTPimQ16v0Qwo10zfQ6XL9NA6AT0X2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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