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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8060677b6dc8b3ec00639e1378a481951088cf7412c16868867bb6a9beae7f8c' 
  AND token = 'y6qA1ll/ElIWPSEHLK/IERrwP1Lp8PbqrBY5umx7jbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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