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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c059abbc6fe1f6228b086efd31cb2d875b0c5b14e7f25d896235491e7f970941' 
  AND token = 'vA0DS4pAC5HQ3RXBbjRSIU0GWkdd9i6pfexZT3/DykU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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