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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd355b9b548c73bcd774c54936fc165678f030399fd1624e31b7510b860ff1fff' 
  AND token = 'Ta2Igh8YkEdIWLVqS46EfiT5alPbFAF3Zv0O9qHzCSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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