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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdca835607e969aac209a02767d6ed9c78eef73f39d46b67df19d2ea08fc85f' 
  AND token = 'kgV+52l7UdAdiZYygIs7XrCucgOehXnMSJkyjGh+X3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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