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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbbf01b0f359fa60b15185b4f6000339f8899ffda97b00578bdcc7730c6836e' 
  AND token = 'kaie533Lz4e41bS1Eilq7jLJ0BaT6hH8w7GI513O0cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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