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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14019b9783f2bf812729a79d4b0351274140a3d89a073de1a081fedc048c47d' 
  AND token = '8sNLRJbO7m/0831XtSX21T+eHVKRpjeuVZ6atqp1ocA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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