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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ec27f7ca6f2467b71b20f198972ba606fad9365e780dcdd178fb3c4ae060c7' 
  AND token = 'wm0KigSC7FsGPzqFBdTBEphUmBPtVcB2xqua3185tFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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