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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac44db9bf2faddfe4b5253dc2a857ed588f8a2df399fd54dd645dfc781cbad6c' 
  AND token = 'HNvb0DQIz4eZHKRvEDOQiXWrbM/nDU1rUemKKT8r7EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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