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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1671922294bfa61dae317cedcef7962c429f36da52d2d3f47123b7e3329b0133' 
  AND token = 'WS7IiOwQiAhiA5FNL/oLJJ3Ot+nCqY2hAXXOha6f5CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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