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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc807ecdb924cb122b649cf4024ef9ee419df8690fc387fc0b6a5d144edd4b9' 
  AND token = 'dhoHtgjQCir+0KUz0H8/S2gViSKWKDzc3e9Si+F2vWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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