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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb89dbdbce420f9bf6ceeb0e0f883e08800ddb928e11f7f7dca5c5871687f85d' 
  AND token = 'jKdWUTnZaD2X4NUXFd7clKtAjpLZNPaainCTOEz27dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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