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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e05242346849d7cfb5319dbe095af5af893536effc06b427be97b26e0b39663' 
  AND token = '6LyadHOFDmKQhgf8bAu4TZ87NAtLQ7QDlJwiy5MJ/Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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