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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026573fd171b8ecb6783ac15a83f56e610f36a5a0b789e539f048569b73a9fca' 
  AND token = 'mK2d3VmSSvduyZy4Do+g3AJsvbafYAGYb1o1ZM9Xxg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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