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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80931cdb550298d8c4900f217372feacdd247fb66c2d027bc40f8ec80c835ae' 
  AND token = '9MKq8eg7mCoZRVd0XltCfA649A+qxIUDGi+YvOyKHwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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