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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de027ec150fa33a03ab102cc88867c1a6040d7f015400782ef1ff6c356a8fe0' 
  AND token = 'NII0ESodtr4mXqYKx+5jGDtVvYXF1PZIZR/poQ++7F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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