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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f491d3b5082c2ed06499472ad41e2fa9e60f055607ed8dd913e550fca532eef5' 
  AND token = 'CI5m76qr4j+Spc2ddyXIyWVYRKQWvjP0qyMRCMXFBwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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