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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6badaf42f17c2aca353dd7458ae6f17fc8662868dadb69033cfa35c95e8b45d6' 
  AND token = '0904GAV1vhCuwNkEgsV37Q6lpp9j3Q5qVwmqxikv2cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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