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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76db73ec09763fda9d03f025a9e34206fe304088bd1eb8d5c548f188b44e4e4' 
  AND token = 'rOgrFztRk2Qcds4W+81vxt/wP4RHijVRsh5WjPG4HjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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