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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d5dd657265888ec6ab4e2e7d3f53a5ca9c1b1b85e7c48160f739cad90c8a79' 
  AND token = 'hRZo3WzszUTGYJ6xFydewNNrEfIKBZyhoqtueVWIrTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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