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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd68d1d64bb4262a551ba3b6a3fcebf9ea5d6be723461e64545817b3e515597b' 
  AND token = 'BwZlEwcbP2wXl4PmUPgTht6RSqgKstxLoMhNYhTF7m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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