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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75eed73a71a6d5ab2b5a70285500aed6a8a0741df2057dd29391e716d4f776be' 
  AND token = 'pfT5O5qi+Q598q7x2Of7JtpJBm4/DLREdq4gAJ5GyAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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