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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfc0ab5751c17b2e96f66f7a5e051a027a6debcec7c482c16c00cce0ac3e6e0' 
  AND token = 't2SlbjPpBZ6Ism7hXv1lxiHtHBRfkn+/eN5xKI7rVTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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