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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46fb609f938efe727b8fb6cd4bc4c59993728a46a0cf7057233ca283da22c70' 
  AND token = '6QssvzVQMD46R5Iq8wYUnaysNJ6+XUx2uk+fmENVxIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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