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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7af927100c11a12e201bd9b85e364badc127c7df72914c015ab6339e13f400e' 
  AND token = 'CGxQKoKQrhsddqMrTza3ghDf0eWkq1FevV6f2v+cuys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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