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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5e9dea6c65ba6601ede49cc90f5787d5e17b4eecd6f0c0a6e9422912d7f786' 
  AND token = 'XH6GaPe1YiWRZj2LskGa8cxbt+94ipkiHiHRLIGPhUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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