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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2d72020896623095ebfc22bac397fbaf8f7f27062dbb22d5d5c28b80478ef3' 
  AND token = '8IX9tBEUC1XNwv1UB2/6F94Sq6K/gcRbYb6pwR9aEys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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