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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a03e3f3a3bc184b0871ee60d937068c3c7fae33e7983d4b7837300bb526d43b' 
  AND token = '6sQ5gfyjCQushXGv4SN4+7WMOLCWjzonThr25t5fWCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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