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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c046103852ef9c26842f6e33441064a660bf8a8944ce695962b1990e7d1b6785' 
  AND token = 'iZpbhbEow5Kxr2fKyyMmLzE1/ICb7IEM5vw7Z1jk568=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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