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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5495193b1ee1aaeb33c677789e298558c566a6505a31ca90d876830eb887e9' 
  AND token = 'z9KpPJsfEBuwo5QyFZ1tN39we3Y63DY+knqEOlQy2kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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