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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15702b8e1344bd327a102a67d1fe781116d530fb8d3965bcc0c15a5dcf45adf6' 
  AND token = '5qB/eZyVSbDmNHlzRldOPB8H2QSCEHpnkXszCsUC0ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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