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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b540229a2f119ddaf87c52a6120e013d642b02398c1c6b85656f2dcb1516d214' 
  AND token = 'J3ItKN3Gx6xPUOOOwZb8fLHOktpR9ABwdz2KXtmtOEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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