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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc8c56de9a8e7eb9e915551e0c322dfc4fc9e2d31007fd1cdb193fdd6320078' 
  AND token = 'fK/HSoEaA+HxHf2iTLWsl/ptHGxXDZ22C3yt97iiu+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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