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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94eebb749047c37673684321e0f099c80271262ee3a3cf717fd060194dcb889' 
  AND token = '1ydWvj+3wBEbbucjxr8sg3YyIbm70YCLZ4+F2kdT0pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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