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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc42a995c9e6491b4d27cc5ab0978d92893bfa2c403abb3c4aad6b26592af61' 
  AND token = 'GtuMdxY6FtA77WjVGUbA/Cb3rd8J8g/jMG5r6DwlqyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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