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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9284e7e2873a69fdcdc20a1f749ea3349b1fc64a0dbca9f56eb12616a15146' 
  AND token = 'L9KbTX+uviSVc80qJSSp9z9R36qoJKFyXUfkciQl9gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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