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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb552532cc9a538d2f2b1844274547567de92dbf2f7a347bb1ac681ff8efe688' 
  AND token = '/15UFu90klXJg60gUArOBabBZ+kcUmH0AodIYMLosXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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