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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe923c776dfcbc8ee2a94924ad549be445d2e53fcefbd56f6a0084bbf4d93f75' 
  AND token = 'AxxEiB9EaBxeswNvjKY1B+cvM2M2S914AaSlp3lPKlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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