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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd4f0e70f9c573965d9ebc905b17f9dd5f8a2843917aba63e9d76369ad69368' 
  AND token = 'u4DS9LZfgBWxUMgnfmiymhjz529i0ax304X7ZUbaWps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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