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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47307675bcbe72b4e54f897d6ab0d59b1235708f0e78cecb446fae0098aa1158' 
  AND token = 'HAcYsstComA85aLPfgW87WN+A7Y+Tiwf/mDv8V2APGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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