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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c1a749862aac30b11848b8ab69450c365a001c17b1975bd377a5e665d1b65b' 
  AND token = 'Re2UjBNNuwnnTEq4KNnw/1u2w34W8jM653R0eZ/v64k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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