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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e58a923eda93e5a6cd98289d00fcb2897891347cd83d3e9afb65c2b730c785' 
  AND token = '/4eZIJnROxB/YjW8amfwiXL9E8DwvzaF0yscVATcLCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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