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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6fd3d3db621cf4ab72e2174146ed1d93001e2a7a92868a7206d35c13a376a1' 
  AND token = 'LDwaHvA8vi7gQKg2WmkS8aI2QaQX4Z+7IVQ2Ww17vGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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