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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576ef2b978576c3cc9cf8586cc85a3065b223e85554658ed750e3ba78d4aaaf2' 
  AND token = 'T/C98ng+SBHr9ZSYO30ezJdx+oiVacMX1F7AT32T8D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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