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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6697a2bc94805e12b2ab9bb167d2026607d215da69297fe9536e9ab4180e37f5' 
  AND token = 'SXSCNNKd9i8QOtzVynK51j1Y5drLYRGve3JleAA9gbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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