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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c7f41fa7b9f3dc8c9fbfed21a942a26f9f315d96ca7d8a8abe2968c6340c85' 
  AND token = '4j2Gxc3+i1GXbw2M+9Ahde2b43iXd5PyME4tM/xgXIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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