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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422559a8393b88281c878196c6f0c97ce87134d08ba5874925d5d8de920e9931' 
  AND token = 'OQmPHkQ2d9HRAmNN/domYD+Zu2vMQ1nQlw+Cfxcc5FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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