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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151d1d96b59a21b568e63bbcd28ad9ed042a215e0f875510fa096c8b35459eb0' 
  AND token = 'Wl6dSJ5QO4U8x26wJ4Nz9caGcaLA5r9ZuDN2SrLSLks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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