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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97da0c4a14bb10b6037316a5e74a21e054e4ba14c2f326fa9bb1448a4b2eb46' 
  AND token = 'TMahrhRDD1qC1OfrBzmCxraLz5J2Brdb6Qhe5wH5UVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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