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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f867badb7db9a8f451b3e24b0a70a20b670c3124b947d6b57a59dce42f00cc7f' 
  AND token = 'vVVv6l/q5KoDiR7WN9k3ASU9dNzE930FzuqSzwEeeIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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